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Incidentally, its on the pavement (2,3,3)

Ross

I believe the answer is:

by the way

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'incidentally' is the definition.
(I know that incidentally can be written as by the way)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for by the way that I've seen before include "In point of fact" , "At the roadside - incidentally" , "Incidentally, as a rather irrelevant comment" , "At the side of the path?" , "In passing, while we're on the subject" .)

I've seen this clue in The Irish Independent.
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